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Gem sound amplifier #exa 1005

Amplifier quit,had fault lights on

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Please disconnect your speaker from amp first-if fault goen connect your speaker one by one until you find the bad one-check the cable first and change it with new one and then change the speaker-if the fault still you will have a problem in your amp itself.

Posted on Jul 13, 2008

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Gemsound pa 1005 exa keeps shutting off


I Think that something like a transistor is getting hot and then shutting down. Exploring inside might solve the problem of what's getting really hot. You could even get some Servisol Freeze Spray, and wait for it to go off then spray it on the suspected part. That will cool it down and it should start up again. If it does come on, that part will have to be replaced.

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1 Answer

Fault lights on


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

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Pleae check to see if you have over loaded the output with a wrong impedance . If so try to test the speakers and connect accordingly.
Next please check if the input source is bringing in poor signals with noise. try to cut off the hig and low freq to set the treble and bass in mid position. next use a ggood ground to take off any transcient voltage on the body due to any leakage in the power circuits. next you can disconnect and opne the panel and check for dry connections, loose connectors or poor filtering in signal processing or power circuits. If you notice any hum check this out. I hope this helps. Good day

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I would check the devices on the heat sink for that channel. They are the top culprits for the fault.

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Hi...
If it's a straight-up power switch then it will need to be replaced if it works off a relay then the relay is gone.

website

http://www.gemsound.com/contact.html#


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